RU2454772C1 - Control and monitoring device of cubicle switchboard cell - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device includes the first controller (1), the second controller (2) and the third controller (3). The controller (1) is equipped with analogue inputs (4) and discreet inputs (5) for connection to corresponding outputs of cubicle switchboard cell status sensor (6). The controller (2) is equipped with sequential port (7) that is connected to touch screen (8). The controller (3) is equipped with discreet inputs (9) for connection to cell status sensor (6) and discreet outputs (10) that are connected with relay signal conditioner (11) for cell (6) control. Controllers (1), (2) and (3) are interconnected by internal local area network (LAN) (12). Controllers (2) and (3) are equipped with Ethernet double ports: controller (2) - the first double port (13), controller (3) - the second double port (14) that are designed for connection to station bus (15) and bus (16) of digital substation process correspondingly.

EFFECT: improvement of digital processing efficiency and stability of cubicle switchboard cell control.

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Description

Technical field

The invention relates to the field of electric power and can be applied to create new and modernize existing electrical substations in accordance with the concept of digital substation.

State of the art

Known technical solutions for the use of microprocessors and microcontrollers in control devices, monitoring and protection of complete switchgears (switchgear), including gas-insulated switchgear (switchgear) installed on modern high-voltage substations:

- Microprocessor-based relay protection system for switchgear cubicles with gas-insulated insulation and sectional switch control. RF patent for utility model No. RU 56679, IPC G06F 15/16, priority from 04/20/06, publ. 09/10/06.

- Digital control apparatus for gas insulated switchgear. Korean Patent No. KR 20040061776, IPC H02B 13/035, Priority 12/31/2002, publ. 07/07/2004.

- Control and monitoring apparatus for gas insulated switchgear. Korean Patent No. KR 20090085928, IPC G08B 21/00, H02B 13/025, priority dated 05/02/2008, publ. 10/08/2009.

- Control system for gas insulated switchgear. Japan patent No. JP 7177623, IPC H02B 1/24, priority from 12.21.1993, publ. 07/14/1995.

- Controller for gas insulated metal enclosed switchgear. The patent of the People's Republic of China for utility model No.CN 201018218 IPC Н02В 13/035, priority date 02.02.2007, publ. 06/02/2008.

The last technical decision was made as a prototype.

The prototype device contains two interconnected controllers, the first of which is connected to a touch screen and interface modules with sensors and control devices of the switchgear, and the second controller is equipped with means of communication with external devices. The first controller is used to control and monitor the switchgear, and the second - for communication with external devices. To communicate the elements of the device, the prototype uses a serial interface RS232.

In recent years, in order to simplify wiring, increase reliability, ensure interoperability (the ability to interact via an open interface) and interchangeability of control equipment from different manufacturers, a transition to digital substations, i.e. fully digital way of exchanging information within the substation and further - with remote control centers. The principles for organizing such an exchange are stipulated by the set of international standards IEC 61850 “Communication systems and networks at substations”. These standards govern two network bus over Ethernet protocol.

One bus, called the process bus, provides a fast exchange of signals requiring high-performance processing, standardized by the IEC 61850-9-2 protocol and is used to transmit digital values of currents and voltages, transmit GOOSE relay protection messages.

Another bus, called a station bus, provides a slower exchange of information that does not require high-performance processing, is standardized by the IEC 61850-8-1 protocol and is used to exchange data and commands between the relay protection and automation complex (RPA), a complex of an automated process control system ( Automated process control system) of the upper level of the substation and various intelligent electronic devices connected to the process bus.

The disadvantage of the prototype is its inability to provide control and monitoring of the switchgear cell as one of the intelligent electronic devices of the digital substation in accordance with the international standard IEC 61850.

Disclosure of the invention

The technical result of the invention is to increase the productivity of digital processing and the reliability of control of a switchgear cell when it is interfaced with other components of a digital substation and with remote control centers via an interface unified in accordance with IEC 61850.

The subject of the invention is a control and monitoring unit for a complete substation switchgear (digital switchgear) of a digital substation, comprising a first controller equipped with analog and discrete inputs for connecting to the respective outputs of the state switchgear cell sensors, a second controller equipped with a serial port to which a touch screen is connected , and the third controller, equipped with discrete inputs for connecting to the state sensors of the switchgear cell and discrete outputs to which m a relay driver for controlling the switchgear cell is connected, while the first, second and third controllers are interconnected by an internal local area network (LAN), and the second and third controllers are equipped with first and second redundant Ethernet ports for connecting to the station bus and to the bus digital substation process, respectively.

A block diagram of the inventive device connected to a controlled switchgear is shown in figure 1.

The device comprises a first controller 1, a second controller 2, and a third controller 3. The controller 1 is equipped with analog inputs 4 and digital inputs 5 for connecting to the corresponding outputs of the state sensors of cell 6 of the switchgear. The controller 2 is equipped with a serial port 7 to which the touch screen is connected 8. The controller 3 is equipped with discrete inputs 9 for connecting to the state sensors of the cell 6 and discrete outputs 10, to which the shaper 11 of the relay signals for controlling the cell 6 is connected. The controllers 1, 2, and 3 are connected between each other's internal LAN 12. Controllers 2 and 3 are equipped with duplicated Ethernet ports: controller 2 has a first duplicated port 13, and controller 3 has a second duplicated port 14.

Ports 13 and 14 are designed to be connected to redundant communication buses of a digital substation: to a station bus 15 and to a process bus 16, respectively.

The device operates as follows.

The controller 3 directly controls the switching devices of the switchgear cell through the shaper 11 of the relay signals. The information necessary for the execution of control algorithms on the currents and voltages of the main circuits of the switchgear from digital current and voltage sensors and the emergency shutdown command from the relay protection and automation complex, controller 3 receives via process bus 16 in accordance with IEC 61850-9-2. Controller 3 receives information on the state of switching devices directly from switchgear cell 6 via its discrete inputs 9 and from controller 1 via internal local area network 12. Operational control commands from the substation control system, interlocking commands with other cells received by controller 2 via substation bus 15 in accordance with IEC 61850-8-1, are also transmitted to the controller 3 via the internal network 12.

Controller 1 collects information from all sensors of the state of the switchgear cell (including pressure sensors in the switchgear), implements its temporary storage until it is transferred to the upper level, and performs algorithms for diagnosing the state of the switchgear. The controller 1 transmits the received information and diagnostic results via the internal network 12 to the controller 2, which translates it to the upper level of the control system of the substation via bus 15.

Local control of switchgear cell 6 and control and monitoring module itself are carried out from the touch screen 8 connected to port 7 of controller 2, using the internal network 12 to exchange information with controllers 1 and 3.

The structure of the proposed device provides the processing performance and control reliability required for a digital substation due to the optimal distribution of functions between controllers 1, 2 and 3 and the ability to exchange digital data and commands with other smart devices of a digital substation through duplicated ports 13 and 14 via communication buses 15 and 16 respectively.

Claims (1)

The control and monitoring device of a switchgear cell of a digital substation, comprising a first controller equipped with analog and discrete inputs for connecting to the corresponding outputs of the switchgear cell state sensors, a second controller equipped with a serial port to which the touch screen is connected, and a third controller equipped with discrete inputs for connecting to the switchgear cell state sensors, and discrete outputs, to which the relay switch control switchgear switchgear cell is connected, while the first, second and third controllers are connected to each other by the internal LAN, and the second and third controllers are equipped with the first and second redundant Ethernet ports, designed to connect to the station bus and to the bus of the digital substation, respectively.